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Forward-Rapidity Azimuthal and Radial Flow of Identified Particles for = 200 GeV Au+Au and Cu+Cu Collisions. S.J. Sanders (U. Kansas) for the BRAHMS Collaboration. I. Experimental Method. Flow Ring 3 Z = -11 cm. Si Ring 1. Flow Ring 2. Tile Ring 1.

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Forward-Rapidity Azimuthal and Radial Flow of Identified Particles for = 200 GeV Au+Au and Cu+Cu Collisions

S.J. Sanders (U. Kansas)

for the BRAHMS Collaboration

QM 2009, Knoxville

I. Experimental Method

Flow Ring 3

Z = -11 cm

Si Ring 1

Flow Ring 2

Tile Ring 1

QM 2009, Knoxville

Determine v2by reaction plane method


is not measured

The BRAHMS spectrometers identify particles at  =0o (MRS) and 180o (FS) with the corresponding reaction plane angles rp determined by the global detector systems.

QM 2009, Knoxville

Pseudorapidity dependence of charged-hadron elliptic flow


…there is a reduction in the v2 values at forward rapidities that is most pronounced for the more peripheral events.

QM 2009, Knoxville




T.Hirano and Y.Nara, Nucl.Phys.A743(2004)305

…3D Hydro with Glauber IC has good agreement with experiment at mid-rapidity but predicts larger values than observed at forward rapidity.

QM 2009, Knoxville

PHOBOS has shown that the integral v2 values for 200-GeV AuAu fall considerably going to forward rapidity. Is this consistent with the BRAHMS results?

QM 2009, Knoxville


Calculating the integral v2 from the differential…

QM 2009, Knoxville


The integral v2 values decrease at forward rapidity BOTH because of a reduction of the differential v2(pT) values AND a smaller .

QM 2009, Knoxville

There is general agreement of the BRAHMS integral v2 calculated from the pt distributions to the PHOBOS results…

QM 2009, Knoxville

200-GeV CuCu

Very Preliminary


…3D Hydro with Glauber IC does good job in describing data.

QM 2009, Knoxville

III. Identified Particle Results


200-GeV AuAu

QM 2009, Knoxville


…again, 3D Hydro does good job describing more central, mid-rapidity results, including the mass ordering.

QM 2009, Knoxville

Constituent quark scaling has been found to highlight a common behavior for 200-GeV AuAu v2 results for many particle species…

R.A. Lacey and A. Taranenko, nucl-ex/0610029

Scaled yields consistent with ideal hydrodynamics..

QM 2009, Knoxville

Constituent quark scaling of BRAHMS data..


The curve is based on the previously observed behavior near mid-rapidity…

QM 2009, Knoxville

The reduction in azimuthal flow at forward coincides with an apparent reduction in radial flow, as evidenced by values…

=0, 0-10% CuCu



QM 2009, Knoxville

IV. Summary
  • BRAHMS has measured identified-particle v2(pT) at =0,1, and 3 for the Au+Au and Cu+Cu systems at =200 GeV. The differential elliptic flow decreases at forward rapidity.
  • Corresponding measurements of the particle spectra indicate a decrease in at forward rapidity, suggesting a reduction in radial flow.
  • The significant decrease in the integral v2 values going to forward rapidity is found to arise from BOTH the reduction in differential elliptic flow and a reduction in radial flow.
  • 3D Hydro does a good job reproducing the mid-rapidity results for both charged hadrons and identified particles, but predicts too large v2 values at forward rapidity.

QM 2009, Knoxville

The BRAHMS Collaboration

I.Arsene7, I.G. Bearden6, D. Beavis1,S. Bekele6 , C. Besliu9, B. Budick5,

H. Bøggild6 , C. Chasman1, C. H. Christensen6, P. Christiansen6, R. Clarke9, R.Debbe1,

J. J. Gaardhøje6, K. Hagel7, H. Ito10, A. Jipa9, J. I. Jordre9, E.B. Johnson10,

C.E.Jørgensen6, R. Karabowicz3, N. Katryńska3, E. J. Kim4, T.M.Larsen11, J. H. Lee1,

Y. K. Lee4, S.Lindal11, G. Løvhøjden2, Z. Majka3, M. Murray10, J. Natowitz7, B.S.Nielsen6,

D. Ouerdane6, R.Planeta3, F. Rami2, C. Ristea6, O. Ristea9, D. Röhrich8,

, S. J. Sanders10, R.A.Sheetz1, P. Staszel3,

T.S. Tveter11, F.Videbæk1, R. Wada7, H. Yang6, Z. Yin8, I. S. Zgura9, and V. Zhukova10

  • 1Brookhaven National Laboratory, USA,
  • 2 Strasbourg, France
  • 3Jagiellonian University, Cracow, Poland,
  • 6Niels Bohr Institute, University of Copenhagen, Denmark
  • 7Texas A&M University, College Station. USA, 8University of Bergen, Norway
  • 9University of Bucharest, Romania, 10University of Kansas, Lawrence,USA
  • 11 University of Oslo, Norway

QM 2009, Knoxville